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Exactly How Does a CPU Bottleneck a GPU? - Page 4

post #31 of 56
Quote:
Originally Posted by TempestxPR View Post
sorry for bringing this thread back from the dead if i put 2 260gtx in sli with a amd phenom x4 9500 2.2ghz would there be a bottleneck of any kind?
Yes, at 1680x1050 a 2.2ghz quad will likely drop a lot of your FPS since most games are still single thread/dual. you probably need at least 3.0ghz quad. A 3.6ghz quad would greatly take advantage of your gtx 260 sli.

why not just get a single gtx 275 and try to overclock that quad a little more and save yourself from having to upgrade to 2 gtx 260 and a psu.
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post #32 of 56
The GPU is waiting on the CPU to send it more work.


The GPU needs to slow down or risk getting laid off.
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post #33 of 56
Quote:
Originally Posted by slngsht View Post
My cpu bottlenecks my gpu right now. it results in game stuttering
o hell mine does that to on my 775
i get 100 fps in bf2 on my 275 along with 30 gb ocz vertex

good thing im going i7
so that i can play crysis (only played once with 4850 and 4870 in crossfire
then i sold it to buy better cooling cause my coolit pump went out never buy there pumps they suck !!!
post #34 of 56
Quote:
Originally Posted by stewarttr View Post
The GPU is waiting on the CPU to send it more work.


The GPU needs to slow down or risk getting laid off.
lol maybe thats what happen to me lol good thing im a dj didnt hurt me that much
post #35 of 56
Quote:
Originally Posted by dieanotherday View Post
I'm very unfamiliar with this concept which is pretty logical, but I would still like to know the requirements for bottlenecking.

I'm thinking about getting a 4870 for my current computer after I get my bank account setup.
I have an intel celeron at 2.8ghz while the gpu is a 7900GS of XFX at 512Mb, i get bottlenecked cuz simply while the gpu can get loads of graphics running, my cpu can`t read them in the correct time, that's why it`s laggy.

-the simplest sentence.
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post #36 of 56
Quote:
Originally Posted by Clockadile Dundee;7235683 
That tank will be turning left.tongue.gif

I'm sorry but you fail. That tank would be turning right. A tank turns towards the slower tread, so it would turn right. World class trolling, right there tongue.gif.
post #37 of 56
This is a simplified list of what goes on when you play a game.

- The CPU sends draw calls to the graphics driver, These draw calls could be anything from rendering a little tree to a mega battle with loads of explosions.

- The graphics driver then turns that into a scheduled rendering list and feeds it to the graphics card.

- The graphics card renders the list sent to it by the graphics driver.

Now as we all know CPU have varying amount of power, And we also know that games don't just consist of graphics.

There's sound, Physics, artificial intelligence and general game management code all running and requiring processing at the same time that these graphics draw calls are being processed.

Now if a large part of a CPU's resources are being consumed by sound, physics or artificial intelligence then there's not a lot of spare CPU processing cycles left over for processing the draw calls.

Now if you have a relatively weak graphics card this isn't a problem as the CPU could easily keep the graphics driver and thus, The graphics card fed with rendering information.

Now throw a high end graphics card and you're in trouble, With the CPU using it's processing power on other aspects of the game the monster GPU is stood idle waiting for rendering information.

And that is a CPU bottleneck.

It's also the reason why games that do support quad cores always benefit as there's more cores and CPU cycles to generate these draw calls while other cores handle other aspects of the game.

smile.gif
post #38 of 56
Quote:
Originally Posted by Alanhunt123;12560271 
I'm sorry but you fail. That tank would be turning right. A tank turns towards the slower tread, so it would turn right. World class trolling, right there tongue.gif.


Didnt say which way the wheels were rolling atop of the tread tho either....so it could still claim to be turning either way tongue.gif

^^^^^^^
Military Class Trolling right thar!
post #39 of 56
ahh gravediggers...
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post #40 of 56
I think my Athlon II X4 3.5ghz is bottlenecking my GTX 460 (1280x768). When I run MSI Kombustor stability/testing utility, the FPS is about 26fps - when I overclock the GTX 460 to ridiculously dangerous levels, the FPS is still 26fps.

On the plus side, I can play every game on max, just fine. It's kind of annoying there is no point in overclocking my GPU (not to mention my CPU couldn't really overclock past 3.5 no matter the voltage ;/ )
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